Before detailing features, understand the three golden rules:
To ensure clean production and long mold life, follow these specific parameters: injection mold design guide
The DFM (Design for Manufacturing) Report: Before building the mold, a good mold maker will return a DFM report showing how they intend to split the core/cavity, where the gates are, and what concerns they have. Never skip the DFM. It is cheaper to change a 3D model than to weld up a block of steel. The Ultimate Injection Mold Design Guide 1
The plastic solidifies inside the temperature-controlled mold. Mold Design Glossary : A comprehensive glossary of
For a comprehensive foundation in injection mold design, the most authoritative "paper" is the Lanxess Part and Mold Design Guide
Bosses are cylindrical projections, usually for self-tapping screws.